EP 2791763 A4 20150805 - TRACKING OBJECTS ON A TOUCH SURFACE

Title (en)

TRACKING OBJECTS ON A TOUCH SURFACE

Title (de)

VERFOLGUNG VON OBJEKTEN AUF EINER BERÜHRUNGSOBERFLÄCHE

Title (fr)

SUIVI D'OBJETS SUR UNE SURFACE TACTILE

Publication

EP 2791763 A4 20150805 (EN)

Application

EP 12857303 A 20121210

Priority

SE 1151208 A 20111216
US 201161576550 P 20111216
SE 2012051368 W 20121210

Abstract (en)

[origin: WO2013089622A2] A device implements a method of tracking objects on a touch surface of an FTIR based touch- sensitive apparatus. An interaction map is generated (52) that indicates local changes in interaction on the touch surface. The interaction map is processed (53) for identification of positive and negative peaks that represent a locally increased and decreased interaction in the interaction map, respectively. To suppress the impact of interferences, a dedicated first heuristic and/or second heuristic is applied (54) to identify potentially false peaks among the positive peaks. The first heuristic designates a positive peak as a potentially false peak when the positive peak is deemed to be associated with one or more of the negative peaks. The second heuristic designates a positive peak as a potentially false peak when the positive peak is deemed to be located along one of the movement trajectories. Movement trajectories of all objects deemed to exist on the touch surface at a preceding time point are then updated (56) while taking the potentially false peaks into account.

IPC 8 full level

G06F 3/042 (2006.01)

CPC (source: EP US)

G06F 3/0418 (2013.01 - US); G06F 3/04186 (2019.04 - EP); G06F 3/0421 (2013.01 - EP US); G06F 3/04883 (2013.01 - EP US); G06F 2203/04109 (2013.01 - EP US); G06F 2203/04111 (2013.01 - US)

Citation (search report)

[X] WO 2011049512 A1 20110428 - FLATFROG LAB AB [SE], et al
[X] WO 2011049513 A1 20110428 - FLATFROG LAB AB [SE], et al
[A] WO 2010006882 A2 20100121 - FLATFROG LAB AB [SE], et al
[A] WO 2011028169 A1 20110310 - FLATFROG LAB AB [SE], et al
[A] US 2010079408 A1 20100401 - LEONG YAT KHENG [MY], et al
[A] US 2010322550 A1 20101223 - TROTT GARY R [US]
[A] US 2010283785 A1 20101111 - SATULOVSKY JAVIER E [US]
[A] LEVESQUE V: "MEASUREMENT OF SKIN DEFORMATION USING FINGERPRINT FEATURE TRACKING", THESIS SUBMITTED TU THE FACULTY OF GRADUATE STUDIES AND RESEARCHIN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OFENGINEERING AT THE MCGILL UNIVERSITY OF MONTREAL, XX, XX, 1 November 2002 (2002-11-01), pages I - XII,01, XP001197127
See references of WO 2013089622A2

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DOCDB simple family (publication)

WO 2013089622 A2 20130620; WO 2013089622 A3 20130822; EP 2791763 A2 20141022; EP 2791763 A4 20150805; EP 2791763 B1 20181031; EP 3506069 A1 20190703; TW 201346682 A 20131116; US 2014375607 A1 20141225; US 9317168 B2 20160419

DOCDB simple family (application)

SE 2012051368 W 20121210; EP 12857303 A 20121210; EP 18203194 A 20121210; TW 101147360 A 20121214; US 201214365468 A 20121210